Apparatus for measuring the bioelectrical impedance of a living body

a technology of living body and apparatus, applied in the field of apparatus for measuring the bioelectrical impedance of living body, can solve the problems of inability to meet the needs of patients,

Inactive Publication Date: 2002-06-27
TANITA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These stray capacitances will have an adverse effect on the measurement.
The current I1 flowing from the impedance gauge into the high-frequency current supplying cable C1 (measured by the current detector) cannot be equal to the current I3 passing through the impedance Z, thus causing an error in measurement.
Such an error can be corrected to some extent, but no satisfactory correction can be made; as the cables change in position, their stray capacitances vary.
Thus, the measurement will be adversely affected, and the adverse effect

Method used

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  • Apparatus for measuring the bioelectrical impedance of a living body
  • Apparatus for measuring the bioelectrical impedance of a living body
  • Apparatus for measuring the bioelectrical impedance of a living body

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Embodiment Construction

[0029] Referring to FIG. 1, a bioelectrical impedance gauge according to the first embodiment (the so measured bioelectrical impedance being used in analyzing and assessing some components of the living body) comprises mainly a gauge center 1, a pair of high-frequency current supplying probes 21, 22 for supplying two points selected in a living body with a high-frequency current, and a pair of voltage measuring probes 23, 24 for measuring the voltage appearing between another two points selected in the current passage in which the high-frequency current.

[0030] The gauge center 1 includes a control-and-arithmetic operation processing unit 8 for controlling the whole operation of the bioelectrical impedance gauge and for processing the arithmetic operation on measured data, a ROM 2 connected to the control-and-processor 8 for storing the controlling and processing software programs, a RAM 3 for storing the data provided by measurement and the software program for arithmetic operation,...

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Abstract

Disclosed is an improved bioelectrical impedance gauge which is so designed that the high-frequency current flowing between two selected points in a living body may be detected in the vicinity of either selected point, and that the voltage appearing between two points selected in the current passage in which the high-frequency current flows may be applied to a high-impedance buffer circuit proximate to the two points selected in the current passage.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to an apparatus for measuring the bioelectrical impedance of a living body in which the bioelectrical impedance can be determined by making a weak current of high-frequency flow from one to the other selected point in the living body, and by determining the weak current of high-frequency flowing through the current passage between the opposite selected points and the voltage appearing between another two selected points in the current passage in which the weak current flows.[0003] 2. Prior Art[0004] Composition assessment of a selected portion of a living body in terms of its bioelectrical impedance is known from the magazine, "The American Journal of Clinical Nutrition", 41(4)810-817 1985, "Assessment of fat-free mass using bioelectrical impedance measurement of the human body". Also, an apparatus for analyzing the composition in a selected portion of a living body in terms of the bioelectrical impedance appearing...

Claims

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Application Information

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IPC IPC(8): A61B5/053A61B5/05
CPCA61B5/053A61B5/05
Inventor FUKUDA, YOSHINORI
Owner TANITA CORP
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